Comparison between Darwinism and Neo-Darwinism

Darwinism and Neo-Darwinism: Major differences

1.      Proposed by Darwin and Alfred Wallace
It is the modified Darwinism in the light of genetics
2.      Causes of variations are not included in the theory
It includes causes of variations like recombination of genes, hybridisation etc.
3.      Only small, useful and continuous variations help in evolution.
Genetic variations especially mutations help in evolution.
4.      Unit of evolution is individual
Unit of evolution is population
5.      Survival of fittest is the mode of operation of natural selection.
Differential reproduction and comparative reproductive success are the modes of operation of natural selection.
6.      Reproductive isolation is not included as a postulate in Darwinism.
Reproductive isolation is an essential factor in speciation.


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